General Hasham al-Sha'arani †(Division 17)[16] General Mozid Salama (commander of Artillery Regiment 121)[17] Sipan Hemo(YPG commander-in-chief) Military of ISIL 17th Division[17] 1,400–1,440+ fighters 1,400 (Al-Tabqa air base)[21] Foreign intervention in behalf of Syrian rebels U.S.-led intervention against ISIL The 2014 Eastern Syria offensive was an offensive launched by the Islamic State of Iraq and the Levant (ISIL or IS) against government-held military installations in eastern Syria during the Syrian Civil War, after expelling the Syrian rebels from the region.

[17] Late in the evening on 23 July, a 640-men strong Islamic State assault force (of which 40 were infiltrators) launched an attack on the Division 17 base, north of Raqqa, from three sides.

Meanwhile, clashes at the southern perimeter of Al-Hasakah city killed three YPG fighters,[1][35] while 11 Syrian soldiers (including an officer) died while defending the Artillery Regiment 121 base.

[24] On the same day, ISIL forces penetrated the besieged Kwayres air base, east of Aleppo, and captured parts of the airport campus.

[6] However, according to Kurdish sources, government troops recaptured the base after ISIL forces retreated under heavy artillery fire.

[2] According to the state news agency SANA, the military recaptured the Penitentiary center for teenagers, the Martyrs Cemetery and the al-Ahrash area on the southern outskirts of Hasakah.

[43] On 1 August, the military counter-attacked and ISIL forces retreated from areas south-east of Al Hasakah city.

[8] After overnight clashes that started with a triple suicide bombing, on 7 August, ISIL forces captured large parts of the Brigade 93 base.

[31] On 8 August, ISIS repelled a Kurdish and pro-government forces attempt to recapture the Geweran neighbourhood of Hasakah city through the Beiruti bridge.

[21] On 28 August, Syrian fighter jets launched a precise attack on an ISIL HQ in the city of Muhasan, during a meeting between military leaders and sharia judges.

[21] At the beginning of October, 29 soldiers missing from the Brigade 93 base managed to reach the Army headquarters at Al-Hasakah city.

[55] The next day, Special forces and Syrian Army engineers blew up the Political Bridge in Deir ez-Zor, killing all the militants who were on it.